Use at your own risk. APKs & Mods are not always updated right away and are not always perfect. I will always recommend using the OFFICIAL version (via Google Play Store if possible) of Dokkan over my builds. If you are fearful of losing your account please don't try em. There are many other places that do Mods as well that update faster than I can & might have more features than the ones found here.
Make sure once you have the app installed you enable Storage Permissions for it.
Also, crashes can occur if your device/emulator does not have Google Play Services or a Google Account linked up.
I can't do shit about asset download fails. That's out of my reach. Bitch to game maker about that, not me.